Prince Charles Thomas Albert Louis Joseph Constantine of Löwenstein-Wertheim-Rosenberg (18 July 1783 in Bartenstein (today part of Schrozberg) – 3 November 1849 in Heidelberg) was an Austrian officer during the Napoleonic Wars and from 1814 onwards, a member of the landless high nobility.

The noble zu Löwenstein family dates back to the days of Elector Palatine Frederick the Victorious (1425–1476). His children from his morganatic marriage with Clara Tott were not able to inherit the Wittelsbach properties, so they formed a separate noble family. After the death of Count Louis III in 1611, the family was split into two main lines, the Protestant Löwenstein-Wertheim-Virneburg line (later Freudenberg) and the Catholic Löwenstein-Wertheim-Rochefort line.

Prince Charles Thomas was the first-born son from the marriage of Prince Dominic Constantine, Prince of Löwenstein-Wertheim-Rochefort (1762–1814) with Maria Leopoldine, Princess of Hohenlohe-Bartenstein (1761–1807). Prince Charles had six sisters and three half siblings from his father's second marriage. He and his younger brother Constantine were raised during the final years of the Holy Roman Empire. They were very aware of the privileges of the class of Imperial Princes. They were educated at court in Würzburg and later at the court of Prince Clemens Wenceslaus of Saxony, the Prince-Elector of Trier. Nothing is known about any higher education that Charles Thomas may have enjoyed. In 1802, he participated in a diplomatic mission of the Löwenstein-Wertheim-Rosenberg family to Paris.

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